libcasper(3): Correct some warnings found by mandoc

- inserting missing end of block: Sh breaks Bl
- moving content out of list: Pp
- missing comma before name: Nm cap_*
- comma in function argument

libcasper(3): Correct some warnings found by mandoc

- inserting missing end of block: Sh breaks Bl
- moving content out of list: Pp
- missing comma before name: Nm cap_*
- comma in function argument: cap_*
- skipping paragraph macro: Pp after Sh
- sections out of conventional order: Sh AUTHORS

Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D31144

(cherry picked from commit 3251ad29f4295ad73668a46727c5bbf7bbac0cf7)

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libcasper: fix descriptors numbers

Casper services expect that the first 3 descriptors (stdin/stdout/stderr)
will point to /dev/null. Which Casper will ensure later. The Casper
services are forked f

libcasper: fix descriptors numbers

Casper services expect that the first 3 descriptors (stdin/stdout/stderr)
will point to /dev/null. Which Casper will ensure later. The Casper
services are forked from the original process. If the initial process
closes one of those descriptors, Casper may reuse one of them for it on
purpose. If this is the case, then renumarate the descriptors used by
Casper to higher numbers. This is done already after the fork, so it
doesn't break the parent process.

PR: 255339
Reported by: Borja Marcos <borjam (at) sarenet.es>
Tested by: jkim@

(cherry picked from commit aa310ebfba3d49a0b6b03a103b969731a8136a73)

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cap_sysctl.3: Fix bugs in the example

- Correct the type of the sysctl value.
- Initialize the oldsize parameter to cap_sysctlbyname()

Sponsored by: The FreeBSD Foundation

(cherry picked from comm

cap_sysctl.3: Fix bugs in the example

- Correct the type of the sysctl value.
- Initialize the oldsize parameter to cap_sysctlbyname()

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 44bbda649dc6c1cdc5a99641e14c77157967e140)

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